Final answer:
Insulin is a hormone that regulates blood glucose levels by promoting the uptake of glucose by cells and its conversion to glycogen or fats. It also stimulates protein synthesis in muscle.
Step-by-step explanation:
Insulin is a hormone that regulates blood glucose levels. When blood glucose levels rise, the pancreas releases insulin to promote the uptake of glucose by liver cells, muscle cells, and adipose cells, where it can be stored as glycogen or converted to fats. Insulin also promotes protein synthesis in muscle.